Single-particle and magnetic excitation spectra of degenerate anderson model with finite f-f coulomb interaction

Spectral densities of local single-particle, magnetic and charge excitations are calculated for the impurity Anderson Hamiltonian based on the renormalization group approach. Calculation is made in wide range of energy and for various magnitude of f-f Coulomb interaction constant, U_f, and for degeneracy factor from 2 to 5. The width of the peak at the Fermi level in the single-particle spectrum has always comparable scale to the magnetic excitation energy, and is never larger than the hybridization width. In the BIS side of this sharp peak a broad satellite with large intensity appears as a shoulder when U_f is large and the f-electron number is intermediate larger than 1. The band-like peak in BIS of U-compounds, which has much larger width than that of the usual band theory, is interpreted by this broad satellite.